enumerate 'identifier' in switch of enum 'enumeration' is not explicitly handled by a case label
The enumerate has no associated handler in a switch statement.
This warning is off by default. To turn it on, use the warning pragma:
#pragma warning(default : 4061)
Example
enum E { a, b, c }; void func ( E e ) { switch(e) { case a: case b: default: break; } // warning, enumerate 'c' not handled by a case label }